Bass, alongside Garcia and a group of city workers and immigrant rights activists, said she's worried the continued immigration raids are no longer getting the attention they need.
"What is happening to undocumented immigrants is also happening to U.S. citizens, which means that this can happen to anyone, to all of us, at any period of time," Bass said.
Bass is teaming up with Garcia and other congressional Democrats to announce the creation of a new investigative unit that will zero-in on what they call "unlawful and unconstitutional" actions against U.S. citizens and immigrants.
"The House Oversight Committee Democrats are going to look into every single brutal misconduct that ICE is committing," Garcia said.
The new probe will not only focus on Trump and his administration, but also on individual agents out in the field.
Bass once again criticized the federal government for its aggressive and widespread immigration tactics. Democratic leaders representing the greater Los Angeles Area have denounced federal immigration enforcement since operations began in June.
They're asking the public to record ICE activity when they see it and upload the videos to a new master ICE tracker site that they plan to launch within the next few weeks.
Garcia, a ranking member of the House Oversight and Government Reform Committee, said American citizens are being dragged off the streets by masked men and thrown into detention cells without access to attorneys.
"No one, regardless of their background or appearance, should be living in fear of being thrown behind bars by their own government because of their race or what they look like," Garcia said.
Bass and Garcia said there is evidence that more than 170 U.S. citizens have been detained by federal agents.
"This is not the America we know and love. Every person in this country has rights, and DHS (Department of Homeland Security) must stop trampling on our civil liberties. Their actions are unconstitutional, unacceptable, and completely un-American, and we will not stop fighting until this administration is held accountable," Garcia added.
The Trump administration has maintained that federal immigration enforcement focuses on the removal of "violent criminals" and the "worst of the worst." Officials have also denied allegations that detainees are mistreated or held in substandard facilities while in custody.
As for the new investigation, Garcia says Democrats plan to hold a congressional field hearing in Los Angeles so people affected by the ICE sweeps can testify. No date for that hearing has been set yet.
City News Service contributed to this report.